Ebook dev departments ought to have a checklist entitled "Critical Features List". For example, Windows 7 had a PDF reader that incredibly forgot to have a method to go to page N. Can you imagine furiously swiping the touchscreen trying to get to page 462 of a 700 page PDF? The next update, that was fixed :-)
Ya theres another issue, sometimes on my textbooks the page that is in the book (ex pg 100) is not the same as the page in the application (ex pg 107) this causes issues esp. because sometimes their way off. that would be a must have fix.
The Kindle e-format has a way to embed page numbers that correspond to the physical book. It's optional, though, and you can blame the ebook author if it wasn't done or wasn't done right.
yeah thats true, but most text books pdfs that are passed around in higher education are not from the publisher, if you are picking up what I'm putting down. >.>